Environmental Projects by Century West Engineering
Environmental Projects
Alder Basin Sewer Reconstruction Project, City of Portland, Bureau of Environmental Services, Portland, OR
BES to provide engineering design, environmental assessment, and construction oversight services for the Alder Basin Phase 2, Unit 3 project, located in southeast Portland, retained Century West. The project included over 2,000 feet of concrete pipe ranging in size from 36-inches to 96-inches in diameter and 2,000 feet of 48-inch cured-in-place pipe with a total construction cost of over $3.0 million.
Environmental services included identifying site-specific soil and groundwater petroleum contamination, preparing a CMMP for submission to the DEQ, working with BES to include the CMMP in contractor bid specifications, providing environmental oversight during construction, and preparing a final report to document the environmental portion of the project. The identification of site-specific soil and groundwater contamination was completed by researching the historic and current use of adjacent properties to identify areas of potential concern, and by collecting soil and groundwater samples to characterize the contamination. The CMMP identified soil and groundwater sampling protocol, contaminated media management procedures, health and safety requirements for site workers, QA/QC requirements, groundwater treatment requirements, and soil disposal options. Century West’s field geologist was onsite continuously to provide construction oversight of environmental issues and assessment of contractor compliance with the CMMP. The final report documented field procedures, analytical results, contaminated media treatment and disposal procedures, disposal receipts, and conclusions.
Crown Pacific; Various Facilities, WA, OR, ID, NV, AZ
Responsible for assisting with regulatory compliance management, permitting, and hazardous material and oil spill response planning for forest products facilities in Washington, Oregon, Idaho, Nevada, and Arizona. Updated general and individual permits and facility management plans for storm water, non-contact cooling water, and log yard runoff to comply with TMDL development and changing environmental regulations. Water quality testing has included characterizing existing and proposed wastewater discharges, evaluating mixing zones, temperature profiling for potential thermal pollution in a 303(d) listed stream segment, determining potential hydraulic connection between surface water and groundwater for a public water supply well, storm water sampling, groundwater quality monitoring, and background surface water and groundwater quality sampling. Permitting projects have included new and revised general and individual NPDES and State Waste Discharge permits and Underground Injection Control registration.
Environmental Services, Courthouse Square; Marion County, Salem, Oregon.
Environmental services during redevelopment of an entire city
block by Marion County. Phase I and II Environmental Site
Assessments were conducted on existing site structures to
identify potential areas of environmental impact and plan
remedial efforts. Following demolition activities managed
by Century West, cost-effective site remediation was designed
and implemented in coordination with subsurface construction
plans, including development of contractor bid documents,
risk-based corrective actions, decommissioning underground
storage tanks, on-site groundwater treatment and disposal,
excavation of contaminated soil with on-site laboratory
analyses, and regulatory negotiations for site closure.
Provided comprehensive program management integrated with the
site redevelopment team, resulting in effective environmental
solutions.
Market Transport, Ltd., Portland, OR
Prepared and implemented a Storm Water Pollution Control Plan
(SWPCP) and an SPCC plan to bring the Market Transport facility
in Portland, Oregon, into compliance with state storm water and
federal oil spill regulations. Concluded that storm water
discharge limits were exceeded as a result of activities
conducted on-site by a mobile vehicle washing service provider.
Collected samples during storm events and evaluated laboratory
data to confirm effectiveness of relocating vehicle washing to
approved facility and of improved maintenance practices.
Revised SWPCP in July 2000 and recommended source control BMPs
to address contaminants in storm water to comply with
conservative NPDES 1200-COLS storm water permit discharge
benchmarks.
RCRA Site Investigations & Corrective Actions, Tektronix, Beaverton, OR
Since 1995, Century West has worked directly with Tektronix to manage RCRA requirements at the Beaverton campus. The primary RCRA site includes a Corrective Action Program (CAP) conducted in accordance with a RCRA Part B Permit issued by the EPA and the DEQ. The objective of the CAP is to remediate releases of hazardous compounds, primarily chlorinated hydrocarbons, which originated from past waste management activities. The CAP currently includes 13 recovery wells/points to hydraulically contain and remove contaminated groundwater. In addition, scheduled collection of water quality data from approximately 148 monitoring wells are performed to track the groundwater plumes and evaluate system performance.
Specific tasks Century West completed as part of the CAP included: 1) data validation and reporting for all field and analytical data, 2) design and management of the database containing historical CAP data, 3) evaluation of the nature and extent of the groundwater plumes over time, 4) evaluation of the performance of the CAP using groundwater modeling, 5) evaluation of the interaction between groundwater and surface water, 5) preparation of semi-annual CAP performance reports, 6) design and implementation of work plans for additional site characterization, 7) providing remediation system maintenance strategies, and 8) assisting Tektronix with regulatory negotiations.
Century West has also provided additional site investigation and remediation services for a former RCRA hazardous waste container storage facility (Building 10/12) at the Tektronix Beaverton campus. Additional site investigation was completed to further evaluate the nature and extent of chlorinated-hydrocarbon contamination in soil and groundwater. The results from additional investigation were used to expand an existing air sparging/vapor extraction system.
Site Investigation & Remediation, Time Oil, Springfield, OR
Century West decommissioned one 10,000-gallon and two 5,000-gallon USTs at a former gasoline station located in Springfield, Oregon. Decommissioning activities included removal of the USTs, two dispenser islands and associated piping, collection and analysis of soil and groundwater samples, and preparation of a detailed report. Stained surface soils and a hydraulic lift were also removed as well as debris from the demolition of all one site surface structures, and a horizontal vapor well was installed to facilitate soil remediation. Based on the conclusions and recommendations in our decommissioning report, Century West developed and implemented a groundwater and soil remediation plan which included the installation and operation of a duel-phase vapor and groundwater extraction system. After approximately two years of system operation, approximately 80 percent of subsurface contamination has been removed.
Century West designed and implemented several phases of investigation and remediation at Time Oil Company’s Eugene, Oregon site. The work was completed to address gasoline-contaminated soil and groundwater at the former petroleum station. The objective of the investigation portion of the project, which included supervising the drilling of probe and auger borings, installing groundwater monitoring wells, soil and groundwater sampling, and aquifer testing, was to define the extent of the gasoline contamination. Data collected during the investigation were utilized to evaluate remedial alternatives and estimate the associated costs. Century West worked closely with Time Oil Company to design and implement a vapor extraction system to mitigate the soil and groundwater contamination. After operating the system for approximately nine months and following a Risk-Based Corrective Action (RBCA) evaluation for the site, the site obtained a “No Further Action” determination from the DEQ.
South Waterfront Lot #5 Remedial Investigation & Risk Assessment, Portland Development Commission, Portland, OR
In 1997, Century West initiated a Remedial Investigation for a parcel of property (Lot #5) in the South Waterfront Redevelopment Area of Portland. The primary objectives of the Remedial Investigation were to characterize the fill materials underlying the site, determine if the historical use of the site caused subsurface soil and/or groundwater contamination, and determine if contamination previously detected on adjacent sites impacted the soil and/or groundwater beneath the subject property. The investigation was designed to collect sufficient data during initial phases of field work to support a risk evaluation based on the proposed development of the site. All data collected during the investigation was validated using EPA guidelines. Based on the findings of the Remedial Investigation, polynuclear aromatic hydrocarbons (PAHs) and lead were determined to be contaminants of potential concern.
Century West prepared a Risk Assessment to evaluate the risk posed by the contaminants of potential concern. The Risk Assessment, completed using the DEQ’s 1998 and 1999 revised cleanup rules, suggested unacceptable risk to potential future site residents and occupational workers. Century West worked closely with PDC and the site developer to establish site-specific exposure parameters based on the proposed development and land use issues. Century West negotiated with the DEQ to modify the Risk Assessment. Based on our technical arguments, the DEQ approved the modified exposure parameters. As a result, the contaminant concentrations were below the acceptable risk levels for the site and no feasibility study or site remedy was required. A no further action determination is pending.
Subsurface Investigation, Port of Vancouver, WA
Century West completed subsurface investigations to define the extent of petroleum-related soil and groundwater contamination on a former automobile processing leasehold. Specific tasks included preparation of Work Plans, overseeing drilling and test pit explorations to define the extent of contamination, reporting, and budget management. Based on work previously completed by the tenant’s consultant, diesel contamination was believed to be the primary concern. The previous tenant reportedly only used kerosene and, therefore, believed that they had remediated all contamination resulting from their use of the leasehold. However, based on the investigation for the Port of Vancouver, an additional 2,000 cubic yards of kerosene contaminated soil was identified in previous tenant use areas. Century West assisted the Port of Vancouver to further segregate the diesel and kerosene issues, manage the former tenant issues, identify a potential source for the diesel contamination, and evaluate remedial alternatives for the diesel contamination.
UST Decommissioning & Remediation Projects, Flightcraft, Boeing Airfield & Portland International Airport, OR, WA
Century West supervised UST decommissioning, site characterization, and remedial actions for Flightcraft facilities located at Boeing Airfield in Seattle, Washington, and Portland International Airport. Initial tasks included developing overall project scopes of work, obtaining subcontractor bids for the UST decommissioning work, and supervising the UST removals. Petroleum hydrocarbon contamination was detected in soil and groundwater samples collected from both sites. Century West coordinated the excavation and proper disposal of the petroleum contaminated soil. Based on an assessment of remedial alternatives, air sparging and carbon filtration were used to treat petroleum contaminated groundwater removed from the remedial excavation. The results from additional site characterization work and risk assessments were used to negotiate closure with the WDOE and DEQ.
UST Decommissioning and Site Investigation; Clackamas County, OR
Century West provided oversight services for activities performed before, during, and after the decommissioning of 17 USTs located at four Clackamas County-owned sites. The project included preparation of contractor bid documents and an initial investigation of the sites to confirm UST locations and identify potential site issues prior to the decommissioning work. Coordination with subcontractors for utility work and UST removal activities was required during decommissioning of the USTs. Field and analytical data were evaluated and recommendations to obtain site closures for three of the sites were provided to the County's project manager and the Oregon Department of Environmental Quality (DEQ). Soil and groundwater sampling, UST Closure reports, soil and/or groundwater characterizations, and a Spill Prevention, Control and Countermeasure Plan were completed as part of the project. Two of the sites have received “No Further Action” determinations from the DEQ.
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